createLinesNode resolves the line material backend through
materialManager (PER NODE — each material carries the node's own
uLineTex), applies the colormap directly when scalars + a non-null
colormap are requested, then builds the InstancedLinesMesh +
optional picking shadow node.
Lines-node creation helpers for NodeFactory.
createLinesNoderesolves the line material backend through materialManager (PER NODE — each material carries the node's ownuLineTex), applies the colormap directly when scalars + a non-null colormap are requested, then builds the InstancedLinesMesh + optional picking shadow node.